JPS58224283A - Control valve for fluid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a fluid control valve that opens and closes a valve device in response to the displacement of a pressure responsive element (hereinafter referred to as bellows) such as a bellows that is displaced in response to changes in fluid pressure.

In fluid control valves that use this type of bellows to control the flow of fluid in refrigeration equipment and the like, PBP bellows are generally used due to cost, accuracy, and other considerations. This PBP cannot be attached to the casing by using anything other than low-temperature solder with a relatively low melting temperature, such as solder, which is convenient for systems etc.
When Jll-1 silver brazing is used, the characteristics of the bellows change and are damaged due to the welding heat.

Additionally, due to this soldering, careful attention must be paid to airtight welding of the casing and to avoid damage to the soldered parts due to the heat of welding during assembly into the system, increasing assembly costs and refrigeration equipment costs. In addition, if the cooling water is not completely removed to prevent welding heat from being transmitted to the solder parts, moisture, flux, etc. will remain inside, causing corrosion.

The present invention improves the above-mentioned drawbacks by making it possible to press fit the cylindrical mounting portion of the bellows and keep it airtight.

An embodiment of the present invention will be described below with reference to the drawings.

1 is a fluid control valve, 2 is a rotary compressor, 3 is a condenser, 4 is a cavity 2 tube, 5 is an evaporator, 6 is a suction line, and the high pressure inlet lower and high pressure outlet 8 of the fluid control valve 1 are connected to the condenser 3 capillary 74, the low pressure inlet 9 and the low pressure outlet 1o are still interposedly connected to a part of the suction line 6 to form a refrigeration circuit.

The fluid control valve 1 has a high pressure valve device 11 and a low pressure valve device 12 inside.
The high pressure and low pressure are separated by keeping the bellows 13 airtight. The high-pressure valve device 11 is composed of a housing 14 having a valve seat 14a at the tip, a threaded portion 14b formed on the outer periphery, and a ball valve 15, which has a high-pressure outlet 8 on its upper surface. There is a permanent magnet 16 inside the magnet.
The ball valve 16, which is made of a magnetic material, is magnetically attached. Naturally, the magnetic force of the cap 16 is the high pressure valve device 1.
The attraction force of the ball valve 15 to the valve seat 14a due to the pressure difference around 1 is greater than that of the ball valve 15 due to the pressure difference around 1. Still bellows 13 and ball valve 1
Other than No. 5, non-magnetic material such as copper or copper alloy is used. The outer surface of the tip convex portion 13a, which is the contact portion between the bellows 13 and the ball valve 15, is formed into a plane perpendicular to the sliding axis of the ball valve 16. The ball valve 16 has a casing 17
is housed in a substantially cylindrical portion 17a at the top of the cylindrical portion 17
The inner diameter a is formed slightly larger than that of the ball valve 15 so that the ball valve 15 can slide. Further, a thread is formed on the inner surface of the upper end of the cylindrical portion 17a, and the threaded portion 1 of the housing 14
4b are screwed together. The low pressure valve device 12 has a valve seat 19 formed in the center of the upper surface of the low pressure housing 18, and holds a low pressure inlet 9 in the center of the lower part. A groove 18a is formed on the outer periphery of the upper part of the low pressure housing 18, and a plurality of stoppers 21, 21, . The stoppers 21, 21, . . . extend above the leaf valve 20, and are configured such that each tip faces toward the center downward direction, and a certain gap is created between the tip and the leaf valve 2o. . In other words, the low pressure valve device 12 is a check valve mechanism, and when the leaf valve 20 floats upward, it is held at the tip of each stopper 21, 21, . . . , and when it operates, each stopper 2'1, 21・
It slides inside the shaft of... and seals with the valve seat 19.

The bellows 13 is held by a boss 22 and a cap 23vc. The boss 22 has an upper end 22C of the central hole 22a that is approximately the same as the mounting part 13b on the opening side of the bellows 13, and other parts than the upper end 22c of the hole 22a are formed slightly larger than this, and the cap 23 is formed in the center. A hole 23a is formed, and a tapered part 23b is formed at the upper end, the tip of this tapered part 23b is smaller than the inner diameter of the opening 13b of the bellows 13, and the lower end of the tapered part 23b is formed from the lower part of the hole 22a in the center of the boss 22. The gap between the lower part of the hole 22a at the center of the boss and the lower end of the tapered part 23b of the cap 23 is formed to be slightly smaller than the wall thickness of the opening 13b of the bellows 13. Therefore, by fitting the attachment part 13b of the bellows 13 into the central hole 22a of the boss 22 and press-fitting the cap 23, the bellows 13 can be held airtight. The concave portion 13c immediately above the opening 13b of the bellows 13 is formed to have a smaller size than the opening 13b. ''') During the press-fitting, a jig AIC is used to engage and hold the concave portion 13c as shown in FIG.
After holding the bellows 13 and setting the boss 22, the cap 23 is fitted with a press-fitting jig B. At this time, since the jig A engages and holds the recess 13c,
The lower end of the opening 13b of the bellows 13 is supported, allowing reliable press-fitting. A concave groove portion 22b is formed around the entire circumference of the boss 22, and the casing 1
After the casing 17 is inserted into the housing 7, the casing 17 is rolled using a roll or the like so that it runs along the concave groove 22bK, thereby airtightly separating the inside of the housing 17 into two upper and lower chambers.

Therefore, when attaching the bellows 13, the attaching part 13b of the bellows 13 is press-fitted with the boss 22 and the cap 23 to maintain an airtight seal, and when attaching the boss 22 and the casing 17, the casing 17 is expanded so that the concave groove 22b is completely airtight. Since the holding is performed, there is no need to use a joining material such as solder, and the biasing force of the high-pressure valve device 11 compresses the bellows 13 without changing the pie/stiffness of the bellows 13 due to the Hirata bone etc. casing 17 after adjusting its size by rotating housing 14.
It is easy to perform brazing with the fluid control valve 1 in a refrigeration system, and it is easy to braze the inlet and outlet lower piping of 8, 9, and 10 without the need for cooling. It is possible to braze the

As is clear from the above description, the present invention includes a boss having a hole formed with an inner diameter approximately the same as that of the mounting portion of the pressure-responsive element, and a cap member having a minute gap between the inner diameter of the boss and the boss. , the gap has a dimension smaller than the wall thickness of the pressure-responsive element, faces the mounting part of the pressure-responsive element and the hole of the boss, and the cap material is press-fitted and fixed inside the pressure-responsive element to ensure airtightness. A pressure-responsive element is installed, and the valve device is opened and closed by the displacement of this pressure-responsive element.Since the boss casing and extension processing are still used to maintain airtightness, there is no need for any conventional soldering. Not only does it eliminate the need for soldering, but it also simplifies the work (particularly brazing), thereby significantly reducing manufacturing costs and ensuring quality.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the fluid control valve of the present invention and a cross-sectional view of the main part showing the piping of a refrigeration system using the same, Fig. 2 is an assembled view of the main part,
FIG. 3 is an exploded perspective view of the main part of FIG. 2. 1...Fluid control valve, 22...Boss, 2
2a...hole, 23...cap, 1
3...Pressure responsive element (bellows), 13b...
...Mounting part, 11... Valve device, 17...
・・・Casing, 22b・River・Concave groove part. Name of agent: Patent attorney Toshio Nakao (1st person)
Figure 2

Claims (2)

[Claims] (1) A boss having a hole formed to have an inner diameter approximately the same as that of the cylindrical mounting portion of the pressure-responsive element, and a cap formed to have a minute gap between the inner diameter of the boss and the inner diameter of the boss; has a dimension smaller than the wall thickness of the pressure-responsive element,
A pressure-responsive bed with the mounting part of the pressure-responsive element facing the hole of the boss and the cap press-fitted inside the pressure-responsive element to form an airtight seal is housed in the casing, and the displacement of the pressure-responsive element A fluid control valve that opens and closes a valve device. (2) A concave groove is formed around the entire circumference of the boss,
2. The fluid control valve according to claim 1, wherein the casing in contact with the groove is expanded and molded to be airtight.